<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
  <p>test</p>

  <script>
    window.onload = function () {
      console.log('ready')

      return setTimeout(function () {
        console.log('close')
        window.close()
      }, 3000)
    }
  </script>
</body>
</html>